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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
-10/n-2 = 11/n+10 // - 11/n+10
-10/n-(11/n)-10-2 = 0
-10/n-11*n^-1-10-2 = 0
-21*n^-1 = 12 // : -21
n^-1 = -4/7
-1 < 0
1/(n^1) = -4/7 // * n^1
1 = -4/7*n^1 // : -4/7
-7/4 = n^1
n = -7/4
n = -7/4
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